Trolley-control system.



r. E. o'AsB.

TBOLLEY CONTROL SYSTEM. APPLICATION FILED AUG. 24.1910.

PatentedAug. 15, 1911.

JNVEAZTUH THANK E 52a 53' 11 25 A T TDHZVE'Y ,rlnrrnn s'ra rns rarestFRANK E. CASE, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC-COMPANY, A CORPORATION OF NEW YORK.

TROLLEY-CONTROL SYSTEIVI.

' effective means for the protection of the electrical equipment of carsand locomotives in case of over-loads. i

The design of efi'icient over-load protective devices for low voltagesystems is comparatively simple, and the incidental failure of theprotective device on systems of low potential is not aceompanied byserious results, but, in dealing with higher voltages,

difficulties are encountered which often are of a dangerous character.This condition of affairs necessitates some means for the protection ofhigh voltage railway equipment and the personal safety of operators andpassengers, in addition to the ordinary circuit breakers and contaetors,which, in

their present state of development, have been known to fail to open theline when .over-load comes on. I propose to make assurance doubly sureand to relieve the usual protective devices, which are usually locatedin the interior of the car or locomotive, of the more strenuous serviceby taking advantage of the large air gap between the trolley in itslowered position and the trolley wire for opening the circuit upon overloads. By using the trolley as a circuit opener, the over-load devicesas ordinarily used may be of a less expensive design, or possiblyentirely dispensed with, and, furthermore, all the electrical apparatusis simultaneously isolated from the source of power.

ated valve for controlling the supply of air to the trolley operatingcylinder, I provide a valve which is operated by electro-magnetic meanswhen over-load comes on.

For a better understanding of my invention reference may be had to theaccompan ing drawing which shows partly in section Specification ofLetters Patent.

Patented Aug. 15, 1911.

Application filed August24, 19 0. Serial No. 578,656.

andoartly in elevation one embodiment of my invention.

Referring. to'the drawing by numerals, a

pantograph trolley 1, similar to the one shown in my Patent No. 946753,dated January 18, 1910, and similarly equipped, has an operatingcylinder 2 in which are located springs 3, 3 for normally holding thetrolley 1 in its operating position, as shown in the drawing. Thesesprings are in operative relation with their corresponding pistons 4,

4e and piston rods 5, 5, and the latter are linked to crank arms 6, 6for operating the trolley 1. Located on top of cylinder 2 is anauxiliary cylinder 7 whose piston is normally pressed to the right endby a spring 8, and whose U-shaped piston rod 9, together with latch 10(Fig. 5 ofthe patent above referred to) looks position.

-The coil 11 of a suitable electro-magnet is placed in series with themotors as indicated, and upon an over-load pulls up its core 12 againsta spring 13. This core 12 carries the trolley 1 in its lower from itslower end two plungers 14,15 which close alternately. the two ports of atwo port valve 16. The tension of spring 13 is great enough to overcomethe upward pressure" exerted upon plunger ldby the-air pressure inreservoir 17 and distributing pipe 18, and the plunger 15 thereforenormally keeps the lower port of valve 16 closed as shown.

At 19 is shown a motormans ordinary two I way valve by which themotorman may either supply compressed air from pipe 18 through the upperport of valve116 and thence through pipe 20 to cylinder 2 for retractingtrolley 1, or connect this cylinder 2 with the atmosphere and. therebyallow springs 3, 3 to raise trolleyil as the operating position as isshown in the drawing. When over-load comes on, the core 12 pulls up,closes the upper port by means of plunger 14 and lifts plunger 15 fromits seatin the lower port, thereby allowing air to escape through thislower port from pipe 18 to pipe 20 and thence to cylinder 2 forretracting the trolley and opening the circuit. The core 12 hasprojecting upwardly from its upper end a rod with a-head 21. When thecore 12-lifts up, this head 21 is engaged by a spring controlled latch22 so that the core 12 with its plungers 14: and 15 cannot return to itslower position until this latch is'tripped by the motorman. An auxiliarycylinder 23, with its spring controlled piston and piston rod 24, isprovided for tripping latch 22'and is operated simultaneously withtripping cylinder 7 in order that the trolley may be free to ascend atthe same time that plunger 14 descends and opens the upper port of valve16 which connects the trolley cylinder'Q with the atmosphere. Amotorina-ns valve 25, similar to valve 19 and a well known-design,supplies air to the tripping cylinders f? and 23 through a pipe 26. Thecoil 11 has a casing 27 therearound, preferably of magnetic material,which-is screwed onto an enlarged upward extension of the casing ofvalve 16. v

I do not desire to restrict myself to the particular form or arrangementof parts herein shown and described since it is ap parent that they maybe changed and modified withoutdeparting from my invention.

What I claim as new and desire to secure by Letters Patentof the UnitedStates, is

1. In an emergency control system, a 'railway current collector incombination with means for automatically retracting said collector uponover-load.

2. In an emergency control system, arail-' way trolley in combinationwlth means for automatically retracting said trolley upon over-load. l

3. In an emergency trolley control system,

a trolley in combination with electro-magnetic and pneumatic means forautomatically retracting said trolley upon over-load,

4:. In an emergency trolley control system.

a trolley in combination with pneumatic means for retracting saidtrolley, and electromagnetic means for automatically putting saidpneumatic means into action upon overload.

5. In an emergency trolley control system, a trolley operated bypneumatic means, a

valve for supplying compressed air to said pneumatic means and anelectro-magnet in series with the trolley for actuating said valve uponover-load.

6. In an emergency trolley control system, a trolley operated bypneumatic means, a two port valve fon alternately connecting saidpneumatic means to the air supply and tea motormans valve, and anelectr0 m'ag-' net in series with the trolley for actuating said twoport valve to supply air to said pneumatic means upon over-load.

,7. In a trolley control system, a. trolley and an operating cylinderfor same, a two 7 port valve for alternately connecting said cylinder tothe air'supply and tea motormans valve, an electro-magnet in series withthe trolley for actuating said two port valve to supply air to saidcylinder upon ovem loads and a pneumatigally tripped latch forautomatically locking said plungers in the actuated position.

In witness whereof, I have hereunto set' my hand this 23rd day ofAugust, i910.

FRANK E. CASE. Witnesses: v

BENJAMIN B. HULL, HELEN Onronn.

